【摘 要】
：
Polymer-supramolecular double-network hydrogels (PS-DN hydrogels) often show much improved recovery rates than conventional double-network hydrogels because of the fast self-assembling properties,making them attractive candidates for tissue engineering an
【机 构】
：
Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Micro
论文部分内容阅读
Polymer-supramolecular double-network hydrogels (PS-DN hydrogels) often show much improved recovery rates than conventional double-network hydrogels because of the fast self-assembling properties,making them attractive candidates for tissue engineering and flexible electronics.However,as the supramolecular network is dynamic and susceptible to break under low strains,the overall mechanical properties of PS-DN hydrogels are still limited.Here,we report the mechanical properties for PS-DN hydrogels can be sig-nificantly improved by tuning the supramolecular network structures.A single amino acid change of the self-assembling peptide can tune the assembled structures from nanofiber to nanoribbon.Such a microscopic structural change can greatly increase the Young\'s modulus (107.4 kPa),fracture stress (0.48 MPa),and toughness (0.38 MJ·m-3) of the PS-DN hydrogels.Moreover,the structural change also leads to slightly faster recovery rates (＜ 1 s).We propose that such dramatically different mechanical properties can be understood by the impact of individual peptide rupture events on the overall network connectivity in the two scenarios.Our study may provide new inspirations for combining high mechanical strength and fast recovery in double network hydrogels by tuning the supramolecular network structures.
其他文献
为了合理描述11MnNiMo钢材的动态断裂性能,利用INSTRON-5500R万能实验机和霍普金森压杆分别进行准静态和高应变率下的材料力学性能测试,获得了11MnNiMo钢的基本力学性能参数,通过实验结果拟合出J-C本构模型;基于仪器化夏比V型缺口冲击试验获得了材料的冲击断裂性能.结果表明,夏比冲击实验中的起裂时间为0.69 ms,所对应的位移为3.55 mm;而有限元模拟过程中,0.69 ms时所对应的位移为3.667 mm.实验与模拟的误差为3.3％,证明了本文所获得的J-C本构模型能够准确预测11M
Herein,we report a highly chemo-and regioselective vicinal trifunctionalization of aryl iodides by palladium/norbornene (Pd/NBE)catalysis.The key feature of this new method is the introduction of two distinct nitrogen and carbon electrophiles,with a large
Using in situ atomic force microscopy,we visualized the oxidation dynamic process of toroidal lithium peroxide (Li2O2) in a working Li-O2 battery and clarified the correlation between the decomposition behavior and the charging rate.It was found that at a
Recently,the asymmetric nonfullerene acceptors (NFAs) with acceptor-donor-acceptor (A-D-A) structure have been developed rapid-ly,especially for the modification of asymmetric core,asymmetric side chains and asymmetric end groups.In this work,a novel asym
We describe a practical and general protocol for immobilization of heterogeneous catalysts to mechanically robust porous ultra-high molecular weight polyethylene tablets using inter-facial Lifshitz-van der Waals Interactions.Diverse types of powderous cat
A convenient palladium-catalyzed domino cyclization reaction for the construction of bis(benzofuranyl)methane scaffolds bearing an all-carbon quaternary center has been described.In the cascade process,one C(sp2)—O bond,two C(sp2)—C(sp3) bonds as well as
Perovskites (Ba0.5Sr0.5)1-xCo0.8Fe0.2O3-δ (x =0.02,0.05,0.1 denoted as BSCF-0.98,BSCF-0.95,BSCF-0.9,respectively) with A-site cation defects are synthesized by sirnple and efficient sol-gel method and are proved to have better OER catalytic effect than th
Amicetin and congeners constitute a small family of complex pyrimidine nucleosides,which exhibit strong antibiotic activities against Gram-positive bacteria and notably against strains of Mycobacterium tuberculosis.Herein,we report chemical synthesis of a
In this paper,two novel donor-acceptor (D-A) macrocyclic compounds 5 and 7 were successfully synthesized by post-functionalization of a planar dimer macrocycle (1) and a highly twisted trimer macrocycle (2),respectively,via controllable oxidation of metho
The efficient cleavage of carbon-oxygen (C-O) bond is highly important for the transformation of oxygen-rich biomass and industry chemicals.Herein,an efficient[3+3]annulation of β-ketoethers with cyclopropenones in the presence of catalytic base has been